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Electrical Engineering Objective Questions { Electromagnetism }



57. A transmission line of characteristic impedance Z0 is terminated in Z.. The input impedance is
A. ?
B. Z02
C. 2Z0
D. 4Z0

58. Compared to equivalent transmission lines at low frequencies, waveguides are
A. less lossy
B. able to carry more power
C. lighter in weight
D. both and above

59. Characteristic wave impedance is
A. ?
B.167
C. Ex/Hy
D. either or above

60. The wavelength of an EM wave after reflection at an angle on a surface
A. increases in the actual direction of propagation
B. decreases in the actual direction of propagation
C. remains the same as the wavelength perpendicular to the surface
D. remains the same as in free space.

61. Impedance inversion is achieved by use of
A. quarter wave line
B. half wave line
C. full wave line
D. Balun transformer

62. Disturbance due to adjacent power line is called
A. cross talk
B. cross fire
C. inductive disturbance
D. noise

63. Disturbance caused by adjacent telephone line is called
A. cross talk
B. cross fire
C. inductive disturbance
D. noise

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